<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title>OpenLayers Hover Handler Example</title>
        <link rel="stylesheet" href="../theme/default/style.css" type="text/css" />
        <link rel="stylesheet" href="style.css" type="text/css" />        
        <style type="text/css">
            #map {
                width: 340px;
                height: 170px;
                border: 1px solid gray;
            }
            #west {
                width: 350px;
            }
            #east {
                position: absolute;
                left: 370px;
                top: 3em;
            }

            table td {
                text-align: center;
                margin: 0;
                border: 1px solid gray;
            }
            textarea.output {
                text-align: left;
                font-size: 0.9em;
                width: 250px;
                height: 65px;
                overflow: auto;
            }
        </style>
        <script src="../lib/Firebug/firebug.js"></script>
        <script src="../lib/OpenLayers.js"></script>
        <script type="text/javascript">

            OpenLayers.Control.Hover = OpenLayers.Class(OpenLayers.Control, {                
                defaultHandlerOptions: {
                    'delay': 500,
                    'pixelTolerance': null,
                    'stopMove': false
                },

                initialize: function(options) {
                    this.handlerOptions = OpenLayers.Util.extend(
                        {}, this.defaultHandlerOptions
                    );
                    OpenLayers.Control.prototype.initialize.apply(
                        this, arguments
                    ); 
                    this.handler = new OpenLayers.Handler.Hover(
                        this,
                        {'pause': this.onPause, 'move': this.onMove},
                        this.handlerOptions
                    );
                }, 

                onPause: function(evt) {
                    var output = document.getElementById(this.key + 'Output');
                    var msg = 'pause ' + evt.xy;
                    output.value = output.value + msg + "\r\n";
                },

                onMove: function(evt) {
                    // if this control sent an Ajax request (e.g. GetFeatureInfo) when
                    // the mouse pauses the onMove callback could be used to abort that
                    // request.
                }
            });

            var map, controls; 

            function init(){
        
                map = new OpenLayers.Map('map');
                var layer = new OpenLayers.Layer.WMS(
                    'OpenLayers WMS',
                    'http://labs.metacarta.com/wms/vmap0',
                    {layers: 'basic'}
                );
                map.addLayers([layer]);
                
                controls = {
                    'long': new OpenLayers.Control.Hover({
                        handlerOptions: {
                            'delay': 2000
                        }
                    }),
                    'short': new OpenLayers.Control.Hover({
                        handlerOptions: {
                            'delay': 100
                        }
                    }),
                    'tolerant': new OpenLayers.Control.Hover({
                        handlerOptions: {
                            'delay': 1000,
                            'pixelTolerance': 6
                        }
                    }),
                    'untolerant': new OpenLayers.Control.Hover({
                        handlerOptions: {
                            'delay': 1000,
                            'pixelTolerance': 1
                        }
                    }),
                    'stoppropag': new OpenLayers.Control.Hover({
                        handlerOptions: {
                            'stopMove': true
                        }
                    })
                };

                var props = document.getElementById("props");
                var control;
                for(var key in controls) {
                    control = controls[key];
                    // only to route output here
                    control.key = key;
                    map.addControl(control);
                }

                map.addControl(new OpenLayers.Control.MousePosition());
                map.zoomToMaxExtent();
            }
            
            function toggle(key) {
                var control = controls[key];
                if(control.active) {
                    control.deactivate();
                } else {
                    control.activate();
                }
                var status = document.getElementById(key + "Status");
                status.innerHTML = control.active ? "on" : "off";
                var output = document.getElementById(key + "Output");
                output.value = "";
            }
        </script>
    </head>
    <body onload="init()">
        <h1 id="title">Hover Handler Example</h1>
        <div id="west">
    
            <div id="tags">
            </div>
    
            <p id="shortdesc">
                This example shows the use of the hover handler.
            </p>
    
            <div id="map" class="smallmap"></div>
            <p>
                The hover handler is to be used to emulate mouseovers on
                objects on the map that aren't DOM elements. For example
                one can use the hover hander to send WMS/GetFeatureInfo
                requests as the user moves the mouse over the map.
            </p>
            <p>
                The "delay" option specifies the number of milliseconds
                before the event is considered a hover. Default is 500
                milliseconds.
            </p>
            <p>
                The "pixelTolerance" option specifies the maximum number
                of pixels between mousemoves for an event to be
                considered a hover. Default is null, which means no
                pixel tolerance.
            </p>
            <p>
                The "stopMove" option specifies whether other mousemove
                listeners registered before the hover handler listener must
                be notified on mousemoves or not. Default is false (meaning
                that the other mousemove listeners will be notified on
                mousemove).
            </p>
        </div>
        <div id="east">
            <table>
                <caption>Controls with hover handlers (toggle on/off to clear output)</caption>
                <tbody>
                    <tr>
                        <td>long delay (2 sec)</td>
                        <td><button id="longStatus" onclick="toggle('long')">off</button></td>
                        <td><textarea class="output" id="longOutput"></textarea></td>
                    </tr>
                    <tr>
                        <td>short delay (100 msec)</td>
                        <td><button id="shortStatus" onclick="toggle('short')">off</button></td>
                        <td><textarea class="output" id="shortOutput"></textarea></td>
                    </tr>
                    <tr>
                        <td>tolerant (6 pixels)</td>
                        <td><button id="tolerantStatus" onclick="toggle('tolerant')">off</button></td>
                        <td><textarea class="output" id="tolerantOutput"></textarea></td>
                    </tr>
                    <tr>
                        <td>untolerant (1 pixel)</td>
                        <td><button id="untolerantStatus" onclick="toggle('untolerant')">off</button></td>
                        <td><textarea class="output" id="untolerantOutput"></textarea></td>
                    </tr>
                    <tr>
                        <td>stop propagation</td>
                        <td><button id="stoppropagStatus" onclick="toggle('stoppropag')">off</button></td>
                        <td><textarea class="output" id="stoppropagOutput"></textarea></td>
                    </tr>
                </tbody>
            </table>
        </div>
    </body>
</html>
